Very good news, this can happen if the government participates in
controlling bitcoin in its use by the public, because the thing that some countries fear is criminal acts like this, maybe if some countries know they might follow...
Controlling bitcoin? I don't think so why you have said controlling bitcoin since it is decentralized I know you couldn't if your thought is having a regulation that is not right. But that is not directly to the bitcoin they regulate those users in bitcoin probably that's the reason why the illegal users of bitcoin have less and did not have a transaction for criminalities activity. Criminal use has declined due to bitcoin have a transparency transaction that easy to track.
I guess these transparency will lead us soon to a generalized global regulation for Bitcoin and other cryptocurrencies. From Bitcoin and ICO banning, to regulating, and KYC verification. Government will never stop until they wont have full control of cryptocurrency. These criminals are slowly walking away from the "safe heaven" they considered, as not too soon they will all be compromised.